Hello, there were several Oberbach:
You might be right with Oberbach (Wildflecken).
Unfortunately, no church records can be found online.
The diocese of Würzburg is responsible for the area.
The contact details are:
Archive and Library of the Diocese of Würzburg
Domerschulstr. 17
97070 Würzburg
Phone: +49 931 386-67 100
Fax: +49 931 386-67 101
E-mail: abbw@bistum-wuerzburg.de
Homepage:
https://abbw.bistum-wuerzburg.de/